Air conditioning apparatus



, AIR CONDITiONING APPARATUS Filed Dec. 20, 1935 4 Sheets-Sheet lINVENTYOR ZesZer-S, )fez' Z290 Z 82.

Jam 5, 1937.

l S. KElLHOLTZ AIR CONDITIONING APPARATUS Filed Dec. 20, 1933 4 SheetsSheet 2 1937- s. KEILHOLTZ AIR CONDITIONING APPARATUS Filed Dec. 20,1933 4 Sheets-Sheet 3 INVENTOR 1652?? 5. /f6ilfial i1.

Jan. 5, 1937. s. KEILHOLTZ 2,066,688

AIR CONDITIONING APPARATUS Filed Dec. 20, 1955 4 Sheets-Sheet 4 1 A 2 II INVE NTOR g zera Waliz. BY a v I I AT ORNE Patented Jan. 19 37 amoonnrrronmc APPARATUS Lester S. Keilholtz, Detroit, Mich., assignor; bymesne assignments, to Borg-Warner corpora-- tion, a corporation ofIllinois Application December 20, 1933, Serial No. 703,279

14 Claims.

tively inexpensive in construction and which Another object of theinvention is to provide an apparatus forconditioning a limited quantityof air to beforciblydischarged into a room or a plurality ofinterconnected rooms, not only to 2 increase the humidity of all of theenclosed air by diffusion throughout, but to cause such a turbulentcondition in the air that stratification of air at differenttemperatures throughout an enclosure will be greatly decreased.

Another object of the invention is to so con-. 'struct and arrange theparts normally employed in an air conditioning apparatus as to permitthe assembly of such parts in-the minimum amount of space and to permitthe construction of a. cabinet having proportions which will be pleasingin appearance. v

Another object of the invention is to provide an air conditioningapparatus capable of operatmaterial properly arranged thereinforrendering le'ss audible whatever noise maybe created'by the operationof the apparatus.

Another object of the invention is to provide an air conditioningapparatus'in which a water spraying device is so arranged as to producea spray, the -film ofxwhich bursts at its edges into a finely atomizedspray of water, through which the flow of air is directed. for removingboth soluble and insoluble dirt and soluble odors.

Another object of the invention is to provide an air conditioningapparatus consisting of a number of unitary and preferably separableparts which can be assembled and disassembled for service 'andadjustmentwithout any very great amount of effort.

Another object of the invention is to provide in an air conditioningapparatus, a' device for forming a finely atomized spray in a minimum ofing with substantially no audible noise and which is provided with sounddeadening or absorbing enclosed space and in which the region offormation of the spray is located at least a predetermined minimumdistancefrom that portion of the walls of the apparatus about theperiphery of the spray so that a highly efficient atomization of thewater occurs and the pressure thereof is largely spent before the watercontacts the walls of the apparatus whereby a minimum of noise isproduced.

The particular embodiment of the invention 10 disclosed herein, for thepurpose of illustration, consists generally of an inner casing and anouter casing, between, which the air supplied to the apparatus isadmitted and of which the outer. casing is constructed and finished insuch manner 15 as to provide an attractive piece of furniture suitablefor use in homes or elsewhere. The inner casing has a pair of openingsin opposite sides thereof adjacent the top of the "casing and throughwhich air is admitted to a pair of centrifugal blowers arranged adjacentthereto im-' mediately inside the casing, These blowers are arrangedwithin a pair of blower housingslwhich discharge downwardly into themain or lower part .of-the inner casing, and are secured for operation25 upon the opposite ends of a shaft extending transversely of thecasing and driven by a motor which is resiliently mounted between thetwo blower housings.

Arranged just below the aforesaid outlet to the: blower housings andslightly rearwardly therefrom is awater spraying device which is vadapted to discharge a fine spray of water prac tically entirely acrossthe casing beneath the blower housing outlets and in a general directiondownwardly and forwardly from the region of location of the sprayingdevice. The air discharged from the blower housing outlets is adapted toflow through the aforesaid water spray by passing .downwardly into thatportion thereof on one side of the region of location of the sprayingdevice, and being reversed in its direction of flow by the curvature ofthe bottom of the casing, to flow upwardly through that portion of thespray on the opposite side of the 5 region of location of the sprayingdevice. Thereafter the'moisture-laden air is discharged up- "wardly,from behind the blower casings, through an excess moisture eliminatorand scrubber plates and thence outwardly through register- 5c ingopenings in both the inner and outer casings and in which is located agrille device for properly directing the blast of air. discharged andfor preyenting any foreign objects from being inserted through theopenings. In the outlet from the inner casing, between the aforesaidgrille and the eliminator and scrubber plates, is arranged a quantity ofsound-absorbing or deadening material, which tends to reduce to anunobjectionable minimum whatever noise may be created inside the innercasing by the formation of the spray and the flow of air.Sound-absorbing material is also employed not only in the space betweenthe walls of inner and outer casings to absorb any vibration in thematerial of which the casings are formed, but also to prevent, as far aspossible, the transmission of sound between the casings from the inletsthrough which air is supplied to the two blowers.

The air inlets to the apparatus may be provided with suitable removablefilters for precipitating the sooty, oily, sticky and relatively finedirt usually entrained in air, prior to its entry into the inner casing,for preventing the deposit and accumulation of such dirt internally onthe walls and parts of the apparatus.

For a better understanding of the invention, reference may be had to theaccompanying drawings and in which:

Fig. 1 is a front elevational view of an air conditioning apparatusembracing the principles of the invention, and which is installed in aroom of a building with a heating coil located in the furnace of thebuilding for the purpose of supplying heated water to the apparatus;

Fig. 2 is an enlarged view of the apparatus with certain outer portionsthereof broken away so that the interior structure can be seen; i

Fig. 3 is a fragmentary sectional view of the g ppa'atus takensubstantially on line 3-3 of Fig. 4 is a longitudinal sectional viewthrough the apparatus as the latter might appear substantially in theplane of line 4-4 of Fig. 2;

Fig. 5 is a fragmentary sectional view of the apparatus takensubstantially-in the plane of line 5-5 of Fig. 4; r

Fig. 6 is a cross sectional view through the spraying device employed inthe apparatus, and as the device might appear substantially in the planeof line 6-6 of Fig. 4;

Fig. 7 is a. fragmentary cross sectional view through the apparatussubstantially in the plane of line 1-'! of Fig. 4 and showing the blowercasings and motor compartment arranged therein;

Figs. 8 and 9 are sectional views of the blower apparatus takenrespectively on lines 8-8 and 99 of Fig. 7; s

Fig. 10 is a fragmentary sectional view of the apparatus takensubstantially in the plane of lines Ill-40 of Fig. 4;

Fig. 11 illustrates a different form of discharge chamber which may beemployed in the apparatus illustrated by the preceding figure;

Fig. 12 is a form of water heater which, if desired, may be employed inpracticing the, invention;

Fig. 13 illustrates a hot and cold water mixing valve preferablyembraced in the apparatus and employed in the operation thereof; and

Figs. 14 and 15 are side and end elevational views, respectively, of acombined sound-absorbing box and filter, with which the apparatus may,if desired, be provided.

Referring particularly to Fig. 1, there is illustrated at 16, an air.conditioning apparatus or unit supported on the floor ll of a room of abuilding and provided with an electrical conwater'film 56 directedoppositely thereto.

aoeacee ductor or supply cord N which is connected by a plug E9 to anelectrical outlet 2| arranged in the building wall. As shown, theapparatus is supplied with cold water through a supply pipe 22 and withhot water through a supply pipe 23 in the latter of which a heater 24located in the hot air space 26 of an air heating furnace 21 isarranged, although it will be apparent that other arrangements may beprovided for supplying water to the unit at any desired temperature,depending upon the extent of air humldification which it is desired toproduce.

In order to be able to supply a variable mixture of either hot water orcold water or a mixture of both, there can be employed in the apparatus(see Fig. 13) a water mixing valve indicated at 28 and to which thesupply pipes 22 and 23 are attached. From this valve a mixture of hotand cold water in the desired proportions may be discharged through asupply pipe 28. In order to be able to control the proportion of hotand. cold water supplied by the pipe 29, there is 'provided for thevalve 28, a control handle 3| which operates certain well known valvemechanism located inside the valve casing and adapted for producing thisresult. From the pipe 29 water is supplied through a strainer 32 and apipe 33 to a pressure reducing valve 34 which is provided with amanually adjustable control device 36 by which the pressure of watersupplied to the apparatus may be reduced to any desired extent.

From the valve 34 the water is supplied at reduced pressure through apipe 31 (to which a pressure gauge 38 may be attached) to the innercasing 39 of the apparatus through apipe 4| secured thereto, andto aspray nozzle 42 supported upon the upper extremity of pipe 4|.

While the spray nozzle or device 42 can be arranged in any desiredposition inside the casing 39, as illustrated, preferably it is set todischarge a spray of water, the central axis of which is coincidentalwith the axis of the standpipe 4|. The pipe 4 I, which is secured at itslower end in a flanged head 43 secured over an opening in the casing 39,comes through the casing substantially midway between the two side wallsthereof and forwardly of a median plane between the front and rear wallsof the casing. From this location the pipe extends upwardly at such anangle as to locate the nozzle 42 disposed upon the upper end thereofslightly to the rear of the aforesaid median plane and in such positionas to discharge a spray forwardly and downwardly toward the bottom ofthe casing.

The nozzle 42 consists of a relatively small supply casing 44 threadedupon the upper end of the pipe 4|, and having a cavity 46 formedtherein, the' upper open end of which is covered by afrusto-conicalshaped head member 41, the flanged edges 48 of which aresecured rigidly to thecasing 44 by a flanged nut 49 threaded around theouter upper extremity of the casing.

' In the ,central portion of the head member 4'!- there is formed acircular orifice 5| whichis adapted to discharge a small column ofwater, at a pressure determined by the adjustment of the reducing valve34, against the center of a concave or arcuate end portion 33 of a spraytarget or small rod 54. The arcuate end portion 53 is formed inwardly ofthe end of the target 54 in such manner as to reverse the direction offlow of the water column 52 to form a conical shaped The target 54 issecured by a set screw 51 in an opening formed in a split end portion 58of an arcutainedr I The target 64 is so spaced from the side walls ofthe casing 39 and arranged therein, that during operation of theapparatus the minimum distance from target 54 to where the'spray strikesthe inner walls of the enclosing casing is such that a highly efficientatomization of the spray water is effected, and the pressure thereofisl'argely spent before contacting the walls of said casing 39, wherebya minimum of noise is produced; The particular form of the spray aswellas the location of the target are important factors in permittingsuch a highly efllcient utilization of the available enclosed space within the casing 39. V

In order to carry away whatever water may collect upon the parts of thenozzle 42, there is a relatively continuous sheet of metal 61 securedbetween the flanged edges thereof, to provide an arcuate upper section68, a vertical front section 69, an arcuate or a substantiallysemi-cylindrical bottom section II' and an upwardly extending rearsection 12 terminating at its upper extremity at aboutthe same level asthe opposite end of the. sheet to provide a discharge opening I3 fromthe casing interior.

The casing 39 is supported at opposite ends thereof upon a pair ofsupporting frames I4 and I6 secured to the casingvin any suitable manneras by brackets ,II. Secured in the upper front portion of the innercasing 39 just belowthe arcuateupper section 68 of the casing and heldremovably in position therein by screws indicated at "I8, is a frame I9having a lower portion 8| and a back portion 82, thelatter of which isspaced a substantial distance from the back portion I2 of the casing 39in order to provide a passage 83 extending upwardly toward the outletI3. Supported. in spaced relation upon the frame I9, to provide anopening 84 therebetween and'a pair of openings 86 and 81 adjacent thecasing ends 64 and 66, is a pair of blower housings 98 and 89 havingoutlets 9I. and 92, respectively, extending downwardly through thebottom portion 8| of the frame and into a region just above the spray"62 'formed by "the nozzle 42; Y 1

povering the portion of the frame," between the blower housings 88 and89 is'aquantity of sound absorbing material 93 and above which issecured a motor 94 having supporting brackets I 96 and 91 extendingdownwardly therefrom and the lower ends ofwhich are secured to the frameI9 by bolts indicated at 98. The brackets 98 and 9'! are secured to themotor 94 by supports attached at thefuppen ends thereof by resilientblower housings 88 and 89 are adapted to receive centrally thereof theopposite ends of a shaft IOI extending throughthe motor 94 and whichsupport centrifugal blowers I02 and I03 fastened to the shaft endswithin the housings by screws I04.

The electrical supply cord I8 which extends within 'the casing 39,provides electrical energy for operating'the motor 94. The blowers I02and opposite ends thereof, through which the inlet air for the-blowersis provided. Between the ends I06 and the rings I01 of each blower aresecured arcuate forward type blades I08 by which air is dischargedoutwardly at a substantial velocity.

Formed in the remote sides of each of the' blower casings and directlyopposite the blowers I02 and I03 located therein, are inlet openings I09having annular spacing members II I disposed therein which contact withthe inner extremities of inlet ducts II2 secured by screws H3 inopeningsfor'med in the end walls 64 and 66.

The lower edges of the blower housing outlets 9| and 92 are inclineddownwardly'toward the front wall 69 of the casing 39 and in addition areprovided with troughs or drains indicated at II4 which are employed for.the purpose of draining any water collecting upon the walls of thestructure toward the casing front wall 69. Secured with the lowerextremities thereof in the troughs II4 adjacent the side walls 64 and 66and with the upper extremities thereof disposed against the walls, areinclined baflles [I6 and III, and likewise, there are employed betweenthe casings i'nclined bailles H8 and H9 and the upper extremities ofwhich are secured together atv I20. These bailies tend to close up thespace surrounding the outlets and provide means for conveying the watercollecting thereon into the troughs I I4. The rear edges of the outlets9| and 92 are inclined downwardly'in opposite directions, as isindicated at I2I and I22, and such edges also are provided with troughssimilar to the troughs II4'and the opposite ends of which drain into thelatter.

It will be apparent that the entire blower housing structure togetherwith the motor 94 and the blowers I02 and I03 can be removed as-a unitfrom the casing 39 merely by removing screws I 23 55 which hold thearcuate upper section ofthe casing 39 in'position, then removing thescrews" supporting the frame I9 and finally removing the structurethrough the opening formed by the removal of the section 68.

' }From the blower outlets 9| and92, the air is discharged downwardlyalong the front wall 69' of' the inner casing, and therebey'ond isreversed in direction by the semi-cylindrical bottom portion I.Itthereof. Fromtliis-region theair moves upbehind the casing 39 whereitenters the conical-shaped spray by'traversing the side, thereof,thereafter being reversed in its direction of flow by the curved .passesthrough the side of the spray and upwardly into the region 83. As aresult of its passage through the spray, the air becomes more or lessthoroughly mixed with and partially satu-.

rated by the spray, and both soluble dirt and odors and insoluble dirtbeing removed as a result thereof. The flow of air through the spraytends to distort the shape of the spray as well as to cause a deflectionthereof with respect to its axis, but in no event not suflicient todiminish the minimum distance from the target 54 to any portion of theinner walls of the casing'where the spray strikes the same.

Beyond the passage 93 the moisture-laden.air passes through a moistureeliminator and scrubber I26 for further dirt removal and elimination ofwhatever free moisture is still remaining in the air and which isreturned to the humidifying chamber along the rear cabinet wall T2. Thiseliminator and scrubber plate is removably supported upon a pair ofbrackets I21 and I28, the former of which is secured along the edge ofthe blower compartments 88 and 89 and the upper edge of the rear blowercompartment frame 82.

The eliminator and scrubber'plate consists of a frame I29 havingparallel front and rear walls between which are secured a plurality ofreversely curved but substantially parallel separating plates I3I andwhich remove the excess moisture and dirt from the air by dividing thelatter into a plurality of isolated currents subjected toturbulentconditionof flow by the curvature of the plates. As a result ofthis turbulence and the division of the air into currents, the moistureand dirt is thrown out of the currents and upon the walls of the platesfrom whence the moisture and dirt carried thereby drain into the spacebelow. As will beobserved from Fig. 4, the lower edges of all the platesI3I are inclined rearwardly toward the rear wall I2 in order that thewater collecting upon the plates may cling by surface tension to thebottom edges thereof and flow into the humidifying compartmenttherebeneath along the rear casing wall.

In order to provide for the easy installation and removal of theseparator I26, the latter is preferably not secured permanently withinthe upper part of the casing 39, but is merely supported by resting uponthe brackets I21 and I28.

Removably disposed above the opening 13 in the upper part of the casing39, is an outlet casing I32 having an opening I33 in the rearwardlyinclined front surface thereof and around the inner walls of which issecured a quantity of sound absorbing material I34. The casing comprisesa rear wall I36, an upper wall I31 and a front wall I38, the latter ofwhich is flanged as is indicated at I39 around the opening I33. Thefront and rear walls of the casing, indicated at I36 and I38, and alsothe end walls thereof, are flanged inwardly at the bottom, as is shownat I, in order to provide means for securing therein rear and frontsections I42 and I43 of the sound absorbing material I34. An uppersection I44 of this material is secured in the casing against the upperwall I31 and above the edge of the rear section I42, by the upperportion of the opening flange I39.

Secured in the outlet compartment I46 intermediate the aforesaidsound-absorbing walls, is a diagonally disposed section ofsound-absorbing material I41 which is held in position within thecompartment between brackets I 49 engaging the opposite edges thereofand secured between the two compartment ends.

Disposed around the front, sides and top. although not necessarilyaround the rear walls of the casing 39, is an outer finishing casing I5Iwhich extends downwardly to the floor along a considerable portion ofthe distance around the lower edges thereof in order to shield from viewthe water valves and other mechanisms for controlling the spray 42 andwhich are arranged as shown beneath the casing 39. The outer casing I5I,which also extends around the outlet compartment I 32, is provided withan inwardly flanged opening I52 within which is secured a grille I53having any kind of suitably curved sections employed both for thepurpose of controlling the direction of the air blast discharged fromthe outlet compartment I46 within the room and preventing the droppingof large articles through the opening into the casing. At the oppositeends of the outer compartment and adjacent the lower extremity thereof,there is formed a plurality of air inlet openings indicated at I54 andthrough which air for the blowers I02 and I03 is preferably supplied.The air thus admitted passes upwardly around the surfaces of the innercompartment 39 and thereafter flows to the blowers I02 and I93 throughthe blower inlets I I 2.

The passageways formed between wall portions for screening the air as itpasses from the inlet provided by the open end of the box to the opening393 adjacent the opposite end thereof and which coincides with air inletopenings I I2. This filter removes from the air, as the same is passedtherethrough, the-sooty, sticky dirt usually contained in air and theparticles of which are relatively fine and which otherwise wouldaccumulate on the internal walls and parts of the apparatus to reducethe efiiciency thereof as well as to necessitate periodic cleaning ofthe apparatus.

In order to prevent the generation and transmission of sound by thewalls of the inner compartment 39, it is preferable to cover a greaterportion thereof with some adhesive substance and thento apply thereto athin sheet of felt or other sound absorbing material indicated at I35.The end walls of the outer casing also should be spaced a considerabledistance from the end walls of the inner casing in order to provide airinlet passages I51 for permitting the unobstructed flow of air from theinlet openings I54 in the outer casing to the inlets II2 for the blowersI02 and I93.

In the inlet passages I51, in lieu of the soundabsorbing box 202,sections I58 of any suitable sound-absorbing material such as felt, and.which may be secured against the inner surfaces of the end walls of theouter casing-by removable brackets such as are indicated at I59 and I6Imay be employed. The brackets I59, which hold the front edges of thesection I59 in position (see Fig. 3), consist of elongated pieces ofsheet metal having bent ends indicated at I62 which are adaptedresiliently to engage the edges of the sound absorbing materialsections. These brackets can be merely placed in position along thefront wall of theouter compartment, and due to the 'reisfiioncy of-thesound absorbing material which we ends I62 engage, the brackets will beheld in position without further eflort. The

separately secured in position inside of flanges I66 formed on the rearedges of the outer compartment end walls.

As is indicated by Fig. 11, the outlet compartment I32 may be providedwith sound-absorbing material elements such as those indicated at I61,I68, I68, "I, and I12, the first of which is disposed horizontallywithin the front portion of the opening 13 and immediately adjacent theopening I33, while the latter is secured against the upper-wall of thecompartment. The intermediate sections I88, I69, and HI each comprisehorizontal and vertical sections indicated at I13 and I14, respectively,and which are arranged in parallel relation between the openings 13 andI33 in such manner as to divide the space within the compartment I32into a'plurality of parallel outlet passages I16.

The aforesaid sections of sound-absorbing material may be held inposition in any suitable manner as, for example, by brackets I11 securedagainst the end walls of the compartment I32.

As is shown by Fig. 12, the heated water for the apparatus may besupplied by a heater such as' that indicated at I18 which, in thepresent instance, comprises an outer jacket I19, surrounding a hot wateror other pipe I81 having heat radiating fins I95, and having gaskets I82at theopposite ends which are tightly clamped between the jacket and thepipe by clamps indicated at I83. The jacket is provided with a suitablei'nlet,' shown at I84, and an outlet to the apparatus connected to thehot water pipe 23'.

It is to be understood, of course, that these heaters are shown merelyfor the purpose of illustrating heat exchange apparatus generally, inasmuch as'itis generally known that the temperature of the feed water forwater spray such as is illustrated in the apparatus herein disclosed,may be varied for increasing or decreasing the temperature and humidityof room air.

It will be observed that the lower part of the ends of the outer casingI6l are curved outwardly awayfrom the building wall, as is indicated atI86, to provide spaces for accommodating a wall base board indicated atI81 and which is generally employed around the walls of rooms adjacentthe floor. Adjacent the bottom of the base board, the ends of the casingare further re- ,lieved as at I88 for the purpose of providing spacesfor accommodating a molding I89 such as is generally employed incombination with the base board illustrated at I81.

For the purpose of carrying away the water which collects within thebottom of the casing 39, and which is not absorbed by the air passingthrough the spray 62, there is provided a drain pipe indicated at I9|which is secured to the casing 39 in communication with an opening I92formed therein by a coupling member I93. When installing the apparatus,this drain pipe is projected through an opening cut in the room floorand from whence it is extended to communicate with any waste waterdisposal pipewith which the building .in which the apparatus isinstalled may be provided. The only other installation work required forthe operation of the apparatus is the connection of the water supplypipes 22 and 23 (if water at different temperatures is to be employed)and the installation of whatever heat exchange apparatus may beconsidered desirable. Thereafter the apparatus may be put into operationmerely'by connecting the plug I9 for supplying electrical energy to the,motor 94.

The amount of moisture supplied to a room may be controlled throughoutconsiderably wide limits merely by controlling the temperature ofthewater supplied thereto or by changing the. feed water pressure, or both.If the moisture content of the room is to be controlled by thetemperature of the water supplied thereto, the valve 28 may beadjusted'in such manner as to supply water of the desired temperaturethrough the conduit 29 (provided such valve is employed in theapparatus) or if the moisture content of the air is to be controlled bythe sprayfeed water pressure, then this may be varied merely by properlyadjusting the control knob 36 with which the pressure regulating valve34 is provided, as the amount of moisture absorbed by the air normallywill vary, with a variation in the pressure of the water supplied to thenozzle.

While the structures and methods disclosed herein may be considered asillustrating a preferred form and application of the principles ofinvention, there is no intention to limit the invention to anything lessthan is fairly to be considered within the scope of the appended claims.

What is claimed is: g

1. An air conditioning apparatus comprising a casing adapted for thecirculation of air internally thereof, a blower compartment arranged insaid casing and having. blower outlets therein for directing a blast ofair within the casing in a predetermined direction, means fordischarging finely divided liquid particles into said blast of airwithin said casing, said blower outlets having inclined drain meansarranged along the lower edges thereof, for draining moisture,collecting upon the surfaces of said blower outlets, toward the insidewalls of said casing.

2. An air conditioning apparatus comprising a casing adapted for thecirculation of air internally thereof, blower means within said casing ifor circulating the air therein in a predetermined direction, spraymeans for supplying finely ,dividedliquid particles to said air blast,and drain means associated with said spray means for conducting thewater collecting upon the surfaces thereof toward the walls of saidcasing.

, 3. An air conditioning apparatus comprising a casing adapted for thecirculation of air therethrough, means within said casing for moving acurrent of air inwardly of said casing and outwardly therefrom, meanswithin said casing for supplying finely divided liquid particles to saidair current, and means associated with said air moving means and liquidsupplying means for carrying the excess moisture collecting thereontoward the interior surfaces of the side walls of said casing.

4. An air conditioning apparatus comprising a casing adapted for thecirculation of air therein, said casing having a bottom wall havingcontrol apparatus arranged therebeneath, spray means within said casingfor operation in response to the operation of said control means and anouter casing surrounding said inner casing, said outer casing having anapron portion extending around the lower extremity of said inner casingfor partially shielding said control means from view.

5. ,In an air conditioning apparatus, the combination of an inner casingadapted for the circulation of air therein with a separable outer casingdisposed in spaced relation to said inner casing throughout a portion ofits inner surface, said inner casing having an air inlet opening incommunication with said space between said casings and adapted for theadmission of air from said space to said inner casing, said outer casingbeing provided with an air inlet opening to said space between saidcasings, a readily removable filter medium in said space between saidcasings for filtering air prior to its passage through said air inletopening in said inner casing, outlet openings in said inner and outercasings for discharging air from said inner casing, and air conditioningmeans within said inner casing for drawing air into said inner casingthrough said inlet openings and said space between said casings;conditioning said air and discharging the same from said inner casingthrough said outlet openings.

6. In a room or similar relatively small enclosure air conditioningunit, a portable apparatus comprising a container in combination with aseparable, structurally independent casing for partially enclosing thesame, a passageway formed between portions of the walls of saidcontainer and casing and in communication with the atmosphere about thebottom of said unit, an opening in said container in communication withsaid passageway, communicating outlet openings in said container andcasing for directing air discharged from said unit into theregions ofsaid room above said unit, air conditioning means within said containerfor drawing room air through said passageway and opening; conditioningsaid air; and discharging the same through said outlet openings into theregions of said room above said unit, and control means for said airconditioning means disposed externally of said container and concealedby said casing.

7. Air conditioning apparatus comprising a casing adapted to housemechanism for circulating and conditioning air, a pair of elongatedboxes having walls of sound absorbing material externally secured tosaid casing at the sides thereof, said boxes providing air inletpassageways to said casing, a housing internally provided with slabs ofsound absorbing material and secured to said casing at the top thereof,said housing providing an air outlet passageway from said casing, and acabinet structurally independent of said casing and adapted forenclosing said casing, said boxes and said housing.

8 Air conditioning apparatus comprising an integral casing open at thetop thereof, a frame secured within said casing adjacent the upper endthereof and having a back portion spaced from the walls of said casingto define a passage between said back portion and one of the walls ofsaid casing and a blower compartment between said back portion and anopposite wall of said casing, blower mechanism disposed within 'said'compartment and adapted for discharging air downwardly therefrom intosaid casing, separator means disposed within said passage, a housingsecured to said casing above said separatormeans and providing an outletcompartment, said housing being internally provided with slabs ofsound-absorbing material about the opening therefrom, and a cabinetstructurally independent of said casing and adapted for enveloping thesame, said cabinet being provided with a aoeaess grilled openingregistering with the opening in said housing.

9 In a unit air conditioning apparatus, the combination of a casinghaving an inlet and an outlet at the upper end thereof, means for creat-5 ing a spray formation within the lower portion of said casing, meanswithin said casing for drawing air-through said inlet opening andeffecting a flow of air through said spray formation, and thence out ofsaid casing through said 10 outlet opening, an elongated compartmentdisposed on one side of said casing and the internal walls of which areof a rough fibrous material and having an opening in the upper endthereof coinciding with said inlet opening through 16 said casing, and asecond opening disposed at an elevation lower than said first openingand in communication with atmosphere about the bottom of said casing, anair filter secured in said compartment having a low resistance to the 20flow of air therethrough "and a surface area greater than the crosssectional area of the air passageway formed by said compartment.

10. In an air conditioning unit, a casing affording a spray chamberthrough which air 25 is adapted to be passed and having an opening atthe upper end thereof for the discharge of air therefrom, with meanswithin said spray chamber for creating a spray formation therein, and anoutlet chamber in communication with said 30 outlet opening andcomprising a plurality of tortuous passageways formed between aplurality of sheets of sound-absorbing material spaced from each otherby strips secured between said sheets along the side edges thereof. 35

11. In an air conditioning unit, a casing providing a sp ay chamberthrough which air is adapted to be passed and having an opening throughwhich air is discharged therefrom, with means within said spray'chamberfor creating 40 a spray formation therein, and a sound-absorbing boxthrough which said discharged air is passed, in communication with saidopening and comprising a hood having a reduced opening for increasingthe velocity of the discharged air and 45 a plurality of tortuouspassageways formed between spaced slabs of sound-absorbing materialdisposed within said hood and effective for deadening the noisesattending the formation of said spray-and the passage of airtherethrough.

12. In an air conditioning unit, a casing through which air is adaptedto be passed for conditioning the same and having inlet and out-- letopenings at the upper end thereof, a vertical wall dividing the upperportion of said casing, brackets amxed to said wall and to the walls ofsaid casing,ra horizontal wall supported upon said brackets and havingopenings therein, a blower disposed within the compartment formed bysaid walls and upon said horizontal wall, and adapted to draw airthrough said inlet openings and discharge the same downwardly into saidsideadjacent the upper end thereof, a vertical 70.

wall dividing the upper portion of said casing, brackets fixed to said.wall and to the walls of said casing, a horizontal wall supported uponsaid brackets and having openings therein, a blower disposed within thecompartment formed by said horizontal and vertical walls and portions ofthe casing walls and upon said hurl-- zontal wall, and an excessmoisture eliminator disposed in said casing on the oppositeside of saidvertical wall to said blower, means for creat- 14. In an airconditioning unit, a casing pro-' viding a spray chamber through whichair is adapted to be passed and having openings through which air istaken therein and dis charged therefrom, respectively, with means withinsaid spray chamber for creating a spray formation therein, asound-absorbing box through which the discharged air is passed incommunication with one f the openings and comprising a hood having aplurality of tortuous passageways formed by spaced slabs ofsound-absorbing, material disposed therewithin,

with sound absorbing material through which the-intake air passes beforeentry thereof into said casing, said hood and chamber being effectivefor deadeningthe noises attending formaand a chamber the walls of whichare covered tion of the'spray and the passage of air therethrough, anexcessmoisture eliminator disposed within said casing adjacent theoutlet opening, and a removable filter disposed within saidsound-absorbing chamber adjacent the inlet' opening to said casing.

LES'I'ER s. KEILHOL'I'Z.

